Posted by chadd on June 25, 2008 at 06:22:33 from (65.54.98.27):
Our Farmall M overheated out of the blue standing and idling a day or so ago. I added coolant and it only took a quart to bring it above the mesh in the radiator. It no longer overheats, but now it looses cylinders as it warms up. When I start it up, it will run on four, but has a miss. As it gets warm, cylinder 3 cuts out. Then after a while, another cylinder seems to quit. I did a compression test, and it had 85, 90, 68, and 88 psi on cylinders 1 through 4. It has the low compression Kerosene head (6336DD) When I turned it over to reset valves I swear could hear air blowing out on 3 and 4 through the pushrod holes in the head. Also, I see bubbles when I look in the radiator. I am guessing either a cracked head or bad head gasket. Do you think I can get away with just a headgasket, or is the compression low enough on all four that it should get a full rebuild?
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